کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7175888 | 1466581 | 2016 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flow patterns and efficiency-power characteristics of a self-propelled, heaving rigid flat plate
ترجمه فارسی عنوان
الگوهای جریان و ویژگی های بهره وری از یک صفحه تخت سفت و محکم به خودی خود
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کلمات کلیدی
تعداد رینولدز، دامنه نسبت تراکم، وینا تعامل را بیدار می کند گرداب دوقطبی، قدرت و کارایی،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
The aim of the present study is to characterize the flow patterns, propulsion efficiency and power requirements associated with a self-propelled-heaving thin flat plate in a quiescent medium. In this regard, a numerical model using a shifting discontinuous-grid and based upon multi-relaxation-time lattice Boltzmann method is developed to probe the resulting aerodynamics. The influence of kinematic parameters namely flapping Reynolds number Ref (20â100) and plunging amplitude β (0.2-1), and the density ratio Ï* (101â102) on forward flight is pursued. Depending on the kinematics, various periodic vortex shedding characteristics of the plunging plate are observed that lead to modification of the angle of attack as a result of wing-wake interaction and downward jet. The presence of strong vortex dipole at the trailing edge with an attached leading edge vortex are factors responsible for maximum thrust generation. A wing-wake interaction which occurs at low β and high Ref due to weak vortex dissipation and presence of vortex dipole at the trailing edge acting in tandem can lead to achieving high propulsion efficiency. Through surrogate modelling, a set of Pareto-optimal solutions that describe the tradeoff between efficiency and input power for forward flight is presented and offers insight into the design and development of next generation flapping wing micro-air vehicles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluids and Structures - Volume 66, October 2016, Pages 517-542
Journal: Journal of Fluids and Structures - Volume 66, October 2016, Pages 517-542
نویسندگان
Nipun Arora, Amit Gupta, Sanjeev Sanghi, Hikaru Aono, Wei Shyy,